19997: Quasi Repdigit 199..997

First few terms (base 10): \[[19^*7_{10}]_n=\{17,197,1997,19997,199997,\ldots\}\]

General Formula:\[[19^*7_{10}]_n=20\cdot10^{n}-3\]

Equivalent Patterns: \[[59^*1_{10}]_n=3\cdot[19^*7_{10}]_n\] \[[39^*4_{10}]_n=2\cdot[19^*7_{10}]_n\]

See Also: Factorization of 199..997 on stdkmd.net

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